[ExchangeList] Re: Exchange server delivery latency: need help!

  • From: "Mathieu CHATEAU" <gollum123@xxxxxxx>
  • To: <exchangelist@xxxxxxxxxxxxx>
  • Date: Sun, 15 Apr 2007 19:58:33 +0200


any antispam/antivirus on the exchange server ?

Maybe one of your raid is rebuilding all the time ?

no defrag (windows one) scheduled ?

No backup lasting all the day ?

lastly, did you try to reboot ?

Are you on a SAN ?
  ----- Original Message ----- 
  From: Jabber Wock 
  To: [ExchangeList] 
  Sent: Sunday, April 15, 2007 6:16 PM
  Subject: [ExchangeList] Exchange server delivery latency: need help!


  I have an Exchange 2003 server which has started experiencing significant 
latency (lag) in message delivery in the past 2-4 weeks.  Some users (not all) 
are reporting that messages are taking many minutes, sometimes 20 minutes to an 
hour to arrive.  This is true for internal email (sender and recipient both on 
this Exchanges erver) or external email (emails from outside being delivered to 
Exchange user, or Exchange user sending to an external user). 

  I have defragged the store, and also tried moving mailboxes to another store. 
 I have checked event logs for any clues but don't see anything that would 
imply an issue.  The queue is typically very small, 50 to 100 messages, all 
small in size and mostly to non-deliverable external addresses which does not 
sound like it should be holding up everyone else.  The server typically 
processes 10000 to 20000 emails per day so a queue of 90 should probably be OK. 
 RAM usage is less than 50% of physical memory (4GB real, about 1.7GB typically 
used, store.exe is using maybe 800MB to 1.2GB).  No disk errors or issues in 
the event log.  The server CPU is a Xeon 3GHz and CPU utiliztion is always 
quite low, around 10-15%.

  This behavior is relatively recent, perhaps in the last 2-4 weeks.  Server 
traffic has not changed noticeably during that period, i.e. SMTP log files are 
about the same size they have always been, bandwidth usage is about the same 
over the past 6 months etc.  Also, not all users are reporting the issue, but 
there is no obvious pattern to them ( e.g. all on one store, or one OU in the 
AD etc.).

  I did notice that when I was moving mailboxes from one store to another, it 
was slow as molasses.  It took 3 hours to move 10 mailboxes, none of which were 
"huge" (maybe 50MB to 300MB in size).  That seems odd, I would have expected 
the mailbox move (in ESM) to whizz by at amazing speeds especially on a Sunday 

  Any suggestions as to what I should look at to analyze where the latency in 
delivery is?  Are there any tools (apart from "Windows Performance Monitor" 
which I ran but did not show any obvious issues)?  Are there any tuning 
suggestions for Exchange message delivery? 

  Any help would be appreciated! (other than "google is your friend" or "go buy 
some books" thanks LOL).

  best regards
  J. W.

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